A teenager was killed on his third day at work when he was trapped in the conveyor belt of a concrete-crushing machine.
Dean Butler, 15, from Vange in Essex, was cleaning the machine at the Rainbow Shaw Quarry in Linford near Stanford-le-Hope.
A spokeswoman for the Health and Safety Executive said: "He became entangled in the conveyor belt of a concrete-crushing machine. He was working as part of a team and under supervision." She added that the executive would decide if there had been any breach of safety regulations.
Gordon Crick, an HSE construction inspector, said: "Part of the tragedy is that it was a young man on his third day of work, and who, working in that kind of environment, suffered that kind of accident."
Essex Ambulance Service, said the boy was pronounced dead at the scene. Clearserve, which owns the quarry, declined to comment.